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Microchip Technology AT97SC3205T-U3A1C20B
- Part No.:
- AT97SC3205T-U3A1C20B
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 28-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT97SC3205T-U3A1C20B.pdf
- Description:
- FF IND I2C TPM 4.4MM TSSOP SEK
- Quantity:
- Payment:
- Shipping:
Inventory:198
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Product details
Overview
AT97SC3205T-U3A1C20B from Atmel is a TCG-compliant Trusted Platform Module (TPM) 1.2 security IC integrating an AVR® RISC microprocessor, hardware asymmetric crypto engine, FIPS-140-2 certified RNG/AES/SHA/RSA engines, and 2066-byte NV user storage. It operates at 3.3V with I²C interface (400kHz Fast Mode) and targets secure boot, platform integrity verification, and key management in embedded systems.
For engineers reviewing the AT97SC3205T-U3A1C20B datasheet, AT97SC3205T-U3A1C20B pinout, AT97SC3205T-U3A1C20B application, or AT97SC3205T-U3A1C20B equivalent, this page delivers verified package mapping (28-pin Thin TSSOP), confirmed I²C timing constraints, GPIO-Express-00 and PP/GPIO roles, TWI_Wakeup# deep-sleep recovery behavior, and FIPS-140-2 module certification scope.
Technical Context
The AT97SC3205T-U3A1C20B implements the full TCG TPM 1.2 specification stack in silicon, including command parsing, authorization logic, and cryptographic state machine control. Its AVR CPU executes firmware that enforces strict physical security policies, while the dedicated crypto engine offloads RSA-2048 signing, SHA-1 hashing, and HMAC-SHA1 operations without host CPU involvement.
Internal EEPROM stores persistent RSA key pairs and 2066 bytes of user-defined NV data, managed via TCG-standard commands (e.g., TPM_NV_DefineSpace, TPM_NV_Write). The device enters low-power sleep autonomously when idle and recovers only upon dual active-low pulse to TWI_Wakeup# pins - a hardware-enforced isolation mechanism for power-state transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| TCG Compliance | Fully implements TPM 1.2 specification - enables interoperable trusted boot and attestation across Windows/Linux platforms. |
| I²C Interface | 400kHz Fast Mode / 100kHz Standard Mode - requires 800Ω pull-up on SM_DAT and 1.5kΩ on SM_CLK for stable high-speed operation. |
| Crypto Engines | FIPS-140-2 certified RNG, AES, SHA, HMAC, RSA - provides NIST-validated primitives for key generation and protocol-level cryptography. |
| NV Storage | 2066 bytes user-defined space - supports custom secure storage for credentials, certificates, or policy data without host OS dependency. |
| Supply Voltage | 3.3V ±10% - mandates tight decoupling: 2200–4700pF caps <5mm from each VCC–GND pair plus 0.1μF at VCC node <10mm away. |
| Operating Temp | Industrial range: −40°C to +85°C - qualified for deployment in ruggedized industrial controllers and network infrastructure equipment. |
Pinout & Package
AT97SC3205T-U3A1C20B is supplied in a 28-pin Thin TSSOP package (4.40mm × 9.70mm body, 0.65mm pitch) with lead-free, RoHS-compliant finish. Pin 1 is marked by a beveled corner; substrate pad is not present in this variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power Supply Input | 3.3V main supply requiring localized high-frequency decoupling per datasheet layout rules. |
| GND | Ground Reference | System ground return path; multiple GND pins provide low-impedance reference for analog/digital sections. |
| LRESET# | Asynchronous Reset | Active-low reset signal; must remain asserted ≥2μs and held low until VCC stabilizes at power-up. |
| SM_DAT / SM_CLK | I²C Data/Clock | Open-drain bidirectional interface; requires external pull-ups sized for 400kHz timing stability and 50% duty cycle clock. |
| PP/GPIO | Physical Presence Indicator | Hardware-asserted active-high signal indicating physical access; internal pull-down ensures safe default state. |
| GPIO-Express-00 | Dedicated NV Index GPIO | Maps to TPM_NV_INDEX_GPIO_00; internal pull-up allows floating when unused; used for XOR chain output in test mode. |
| TWI_Wakeup# | Deep Sleep Recovery | Two-pin active-low wake sequence required to exit low-power state - prevents spurious wake events. |
| PIRQ# | Interrupt Request Output | Open-drain interrupt signal asserted by TPM to notify host of command completion or event readiness. |
Key Features
| Feature | Design Value |
|---|---|
| Single-chip TPM 1.2 implementation | Eliminates external firmware storage and discrete crypto accelerators - reduces BOM count and attack surface. |
| FIPS-140-2 Level 2 certification | Covers RNG, HMAC, AES, SHA, and RSA engines - satisfies compliance requirements for government and enterprise deployments. |
| Hardware Physical Presence (PP) support | Enables BIOS-level enforcement of administrative actions (e.g., clearing ownership) only when hardware switch is asserted. |
| Dynamic key cache management | Automatically handles RSA key loading/unloading via TPM_FlushSpecific and TPM_LoadKey2 - no host driver memory management overhead. |
| Low-power autonomous sleep | Enters sleep mode automatically during idle periods; recovers only via validated dual-pin TWI_Wakeup# sequence - extends system standby time. |
Applications
| Secure Boot Validation | Platform Integrity Attestation |
|---|---|
Use Scenario: Verifying firmware image authenticity before execution in industrial PLCs and medical devices. IC Role / Device Role / Timing Role: TPM acts as root-of-trust anchor, measuring boot components into Platform Configuration Registers (PCRs) and signing PCR values with embedded RSA key. Use Value: Prevents unauthorized firmware modification by cryptographically binding execution to measured hashes - meets IEC 62443-3-3 SL2 requirements. | Use Scenario: Remote verification of server hardware/software state in cloud infrastructure. IC Role / Device Role / Timing Role: Generates signed quotes of PCR values upon request from remote verifier using TPM_Quote command. Use Value: Enables zero-trust architecture by proving runtime integrity without exposing sensitive keys - supports TCG D-RTM and Intel TXT workflows. |
| Hardware-Based Key Storage | FIPS-Compliant Cryptographic Offload |
Use Scenario: Storing TLS private keys for encrypted communication in network appliances. IC Role / Device Role / Timing Role: Securely generates, stores, and signs with RSA-2048 keys inside tamper-resistant boundary; keys never exposed to host memory. Use Value: Mitigates cold-boot and DMA attacks by isolating key material - satisfies PCI-DSS Requirement 4.1 and NIST SP 800-57 Part 1 Rev. 5. | Use Scenario: Accelerating certificate validation and digital signature generation in edge gateways. IC Role / Device Role / Timing Role: Executes SHA-1, HMAC-SHA1, and RSA signing operations in dedicated hardware - offloads ~95% of crypto workload from host CPU. Use Value: Reduces host CPU utilization by >40% during TLS handshake bursts - improves real-time responsiveness in resource-constrained devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TPM 1.2 security module applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Infineon SLB9665TT2.0 | Supports both I²C and SPI interfaces; includes optional LPC interface; certified to Common Criteria EAL4+ (vs. FIPS-140-2 Level 2). | Broader host interface flexibility but lacks GPIO-Express-00 and PP/GPIO pin assignments identical to AT97SC3205T-U3A1C20B. | Select when multi-interface support or CC EAL4+ is required over FIPS-140-2 alignment. |
| NXP PCF5122A | TPM 2.0 compliant; uses ECC-based crypto (NIST P-256); smaller 32-pin QFN footprint; no AVR CPU core. | Not backward-compatible with TPM 1.2 software stacks; requires firmware rewrite and new key provisioning infrastructure. | Select for greenfield designs targeting TPM 2.0 mandates and ECC efficiency - not for drop-in replacement. |
Compared with Infineon SLB9665TT2.0 and NXP PCF5122A, the AT97SC3205T-U3A1C20B offers precise TPM 1.2 feature parity, integrated AVR-based firmware extensibility, and GPIO-Express-00 for custom NV-indexed control - making it optimal for legacy-compliant, field-upgradable embedded security deployments.
Availability
AT97SC3205T-U3A1C20B is available at Aetrix Electronics and suitable for industrial control systems, network infrastructure equipment, and medical diagnostics devices requiring stable component supply, long-term lifecycle assurance, and FIPS-140-2 validated security functionality.
Supply support for AT97SC3205T-U3A1C20B includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Atmel Corporation (acquired by Microchip Technology in 2016) was a fabless semiconductor company specializing in microcontrollers, nonvolatile memory, and security ICs. Known for AVR® architecture and robust embedded security solutions.
The AT97SC3205T product line delivers turnkey TPM 1.2 modules targeting embedded systems needing certified hardware-rooted trust - emphasizing minimal host integration effort, deterministic low-power behavior, and physical presence enforcement.
FAQ
What is the primary security certification level for the AT97SC3205T-U3A1C20B?
The AT97SC3205T-U3A1C20B is FIPS-140-2 Level 2 certified, covering its hardware random number generator (RNG), HMAC, AES, SHA, and RSA cryptographic engines. This certification validates the module's design, implementation, and operational security for use in U.S. federal and regulated industry applications requiring cryptographic assurance. The AT97SC3205T-U3A1C20B achieves this through physical tamper resistance, role-based access control, and algorithmic correctness testing - all verified under the FIPS-140-2 standard.
Does the AT97SC3205T-U3A1C20B support both commercial and industrial temperature ranges?
Yes, the AT97SC3205T-U3A1C20B is qualified for industrial temperature operation from −40°C to +85°C, as confirmed in the ordering information section of the summary datasheet. It is also offered in commercial grade (0°C to +70°C), but the U3A1C20B suffix specifically denotes the industrial variant. This makes the AT97SC3205T-U3A1C20B suitable for deployment in harsh environments such as factory automation controllers, outdoor networking gear, and transportation infrastructure systems where thermal stability is critical.
How does the AT97SC3205T-U3A1C20B handle low-power states and wake-up events?
The AT97SC3205T-U3A1C20B enters low-power sleep autonomously when idle, with no host intervention required. Recovery requires a precise dual-pin active-low pulse sequence on both TWI_Wakeup# pins - a hardware-enforced mechanism preventing accidental or malicious wake events. This behavior is distinct from standard I²C wake-up and ensures deterministic power-state transitions. The AT97SC3205T-U3A1C20B implements this via internal state machine logic tied directly to those pins, independent of firmware execution.
What GPIO functions are uniquely assigned on the AT97SC3205T-U3A1C20B?
The AT97SC3205T-U3A1C20B features two purpose-dedicated GPIOs: GPIO-Express-00 maps to TPM_NV_INDEX_GPIO_00 for NV-managed state storage and serves as XOR chain output during I/O test mode; PP/GPIO functions as the Hardware Physical Presence indicator, active-high with internal pull-down. These assignments are fixed in firmware and cannot be reconfigured - they enable standardized TPM 1.2 administrative controls (e.g., ownership clear) and custom NV-indexed signaling without host driver modification.
Is the AT97SC3205T-U3A1C20B compatible with TPM 2.0 software stacks?
No, the AT97SC3205T-U3A1C20B implements only the TCG TPM 1.2 specification and is not compatible with TPM 2.0 software stacks. It lacks support for ECC algorithms, hierarchical key structures, and the updated command set defined in TPM 2.0. Attempting to use TPM 2.0 drivers or management tools with the AT97SC3205T-U3A1C20B will result in protocol errors or initialization failure. For TPM 2.0 compliance, a different part such as the NXP PCF5122A must be selected - the AT97SC3205T-U3A1C20B remains strictly a TPM 1.2 solution.
AT97SC3205T-U3A1C20B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Applications:
- Trusted Platform Module (TPM)
- Core Processor:
- AVR
- Program Memory Type:
- EEPROM
- Controller Series:
- -
- RAM Size:
- -
- Interface:
- I2C
- Number of I/O:
- 4
- Voltage - Supply:
- 3.3V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP
AT97SC3205T-U3A1C20B FAQ
1.How can I place an order for AT97SC3205T-U3A1C20B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT97SC3205T-U3A1C20B on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AT97SC3205T-U3A1C20B reliable?
The price and inventory of AT97SC3205T-U3A1C20B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT97SC3205T-U3A1C20B is usually 5 days.
3.What payment methods are accepted for AT97SC3205T-U3A1C20B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT97SC3205T-U3A1C20B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT97SC3205T-U3A1C20B?
AT97SC3205T-U3A1C20B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT97SC3205T-U3A1C20B order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AT97SC3205T-U3A1C20B?
For technical support, including AT97SC3205T-U3A1C20B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT97SC3205T-U3A1C20B requirements.
6.How does Aetrix verify that AT97SC3205T-U3A1C20B is sourced from the original manufacturer or authorized distributors?
All AT97SC3205T-U3A1C20B products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AT97SC3205T-U3A1C20B meets industry standards.
7.What is the process for return or replacement of AT97SC3205T-U3A1C20B?
All AT97SC3205T-U3A1C20B units undergo pre-shipment inspection (PSI). If there is an issue with AT97SC3205T-U3A1C20B, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AT97SC3205T-U3A1C20B part is unused and in its original packaging.
Return procedure for AT97SC3205T-U3A1C20B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT97SC3205T-U3A1C20B Tags
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CYPD3175-24LQXQ
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